Effects of hygroscopicity on aerosol optical properties and direct radiative forcing in Beijing: Based on two-year observations

被引：10

作者：

Xia, Can ^{[1
,2
,3
]}

Sun, Junying ^{[2
,3
]}

Hu, Xinyao ^{[2
,3
,4
]}

Shen, Xiaojing ^{[2
,3
]}

Zhang, Yangmei ^{[2
,3
]}

Zhang, Sinan ^{[2
,3
]}

Wang, Jialing ^{[2
,3
]}

Liu, Quan ^{[2
,3
]}

Lu, Jiayuan ^{[2
,3
]}

Liu, Shuo ^{[2
,3
]}

Zhang, Xiaoye ^{[2
,3
]}

机构：

[1] Nanjing Univ Informat Sci & Technol, Sch Atmospher Phys, Nanjing 210044, Peoples R China

[2] Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing 100081, Peoples R China

[3] Chinese Acad Meteorol Sci, Key Lab Atmospher Chem, CMA, Beijing 100081, Peoples R China

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2023年 / 857卷

基金：

中国国家自然科学基金;

关键词：

Scattering hygroscopic growth factor; Single scattering albedo; Scattering Angstr?m exponent; Backscatter fraction; Aerosol direct radiative forcing; LIGHT-SCATTERING ENHANCEMENT; FILTER-BASED MEASUREMENTS; SURFACE BOUNDARY-LAYER; RELATIVE-HUMIDITY; HUMIDIFICATION FACTORS; RIVER-DELTA; RURAL SITE; GROWTH; CHINA; COEFFICIENT;

D O I：

10.1016/j.scitotenv.2022.159233

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The influence of relative humidity on aerosol properties and the direct radiative forcing of PM10 and PM1 were inves-tigated in Beijing from January 2018 to December 2019. The annual mean scattering hygroscopic growth factor at RH = 80 % [f(80 %)] of PM10 and PM1 were 1.60 +/- 0.24 and 1.58 +/- 0.22, respectively. The variation of aerosol hygro-scopic growth factors of PM10 and PM1 aerosols was similar, which is mainly due to the fact that aerosol scattering in Beijing is dominated by fine particles. The seasonal mean f(80 %) of PM10 from spring to winter were 1.66 +/- 0.23, 1.71 +/- 0.25, 1.51 +/- 0.20, 1.49 +/- 0.16, respectively, which were higher in spring and summer, and lower in autumn and winter. The diurnal variation of f(80 %) was relatively higher from 12:00 to 18:00, which could be related to the formation of secondary aerosols by photochemical reactions. f(80 %) shows a strong positive relationship with both the scattering Angstrom exponent (SAE) and the single scattering albedo (co0) under dry conditions; therefore, the scat-tering hygroscopic growth factor could be estimated using these two parameters. The upscatter fraction (f3) and single scattering albedo, which are the key aerosol optical properties for the calculation of direct radiative forcing, are also RH-dependent. As RH increases, the upscatter fraction (backscatter fraction) decreases and to0 increases. The aerosol radiative forcing at RH 80 % was 1.48 times as that in the dry state. The sensitivity experiment showed that the var-iation in the scattering coefficient with relative humidity had the greatest influence on radiation forcing, followed by f3 and to0. The seasonal variation of AF(80 %)/AF(dry) coincides with that of the aerosol hygroscopic growth factor. Our study suggests that understanding the influence of relative humidity on aerosol properties and direct radiative forcing is important for accurately estimating the radiative forcing of aerosols.

引用

页数：16

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